package com.hmdp.utils;

import com.hmdp.dto.UserDTO;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @author 陈俊宇
 * * @date 2025/9/23
 */
public class LoginInterceptor  implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取session
        HttpSession session = request.getSession();
        // 2.获取session中的用户
        Object user = session.getAttribute("user");
        // 3.判断用户是否存在
        if (user == null) {
            // 4.不存在,拦截,返回401
            response.setStatus(401);
            return false;
        }

        // 5.存在,保存用户信息到ThreadLocal
        UserHolder.saveUser((UserDTO) user);


        // 6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        UserHolder.removeUser();
    }
}
